【正文】 ... 16 制作一個工程的一般過程 ..................................................................................................... 17 第 3 章 組態(tài)軟件 iFix簡介 ................................................................................................................................. 19 iFix 功能 ................................................................................................................................................. 19 IFIX 的工作機制 ..................................................................................................................................... 19 IFIX 新建工程與配置 ............................................................................................................................ 19 工作臺 .................................................................................................................................................... 20 數(shù)據(jù)庫管理器 ........................................................................................................................................ 21 第 4 章 基于 GE PAC RX3i 液位控制系統(tǒng)設計 .............................................................................................. 22 PID 理論知識 ......................................................................................................................................... 22 PID 控制器 ................................................................................................................................ 22 模擬 PID 控制原理 ................................................................................................................. 22 數(shù)字 PID 控制算法 ................................................................................................................. 24 系統(tǒng)控制原理 ........................................................................................................................................ 25 硬件連接 ................................................................................................................................................ 25 軟件設計 ................................................................................................................................................ 27 主程序模塊 .............................................................................................................................. 28 初始化模塊 .............................................................................................................................. 29 PID 程序 ................................................................................................................................. 29 第五章 基于 IFIX 的液位監(jiān)控系統(tǒng)的設計 ....................................................................................................... 32 監(jiān)控系統(tǒng)的設計 ................................................................................................................................... 32 創(chuàng)建 IFIX 系統(tǒng)工程 ................................................................................................................ 32 創(chuàng)建組態(tài)畫面 .......................................................................................................................... 33 構造數(shù)據(jù)庫 .............................................................................................................................. 34 運行與調(diào)試 ........................................................................................................................................... 36 通訊的調(diào)試 .............................................................................................................................. 36 數(shù)據(jù)連接的調(diào)試 ...................................................................................................................... 36 PID 比例、積分、微分參數(shù)值整定 ...................................................................................... 37 結 論 ................................................................................................................................................................. 43 參考文獻 ................................................................................................................................................................. 45 西南交通大學本科畢業(yè)設計（論文） 第 1 頁 第 1 章 緒 論 PLC 的發(fā)展及過程控制簡介 20 世紀 20 年代起，人們把各種繼電器、定時器、接觸器及其觸點按一定的邏輯關系連接起來組成控制系統(tǒng)，控制各種生產(chǎn)機械，這就是大家所熟悉的傳統(tǒng)繼電接觸器控制系統(tǒng)。主控器采用 PACSystems RX3i 系列的 IC695CPU310 模塊，控制對象為實驗室的水箱液位設備，采用以太網(wǎng)進行通訊，用 PME 軟件完成了系統(tǒng)硬件配置，各個模塊的的梯形圖設計與調(diào)試，實現(xiàn) 了任意液位高度的手動 /自動調(diào)節(jié)。 4. 學習組態(tài)軟件 iFix 程序開發(fā) 。GE PACSystems 提供第一代可編程自動化控制系統(tǒng)，為多個硬件平臺提供一個控制引擎和一個開發(fā)環(huán)境，與現(xiàn)有的 PLC相比具有更強的處理速度和通信速度。 學生應完成的任務 1． 查閱有關 PACSystem RX3i 系統(tǒng) 的國內(nèi)外研究資料和文獻，學習 PAC RX3i 系統(tǒng)的內(nèi)部結構、工作原理、編程環(huán)境等相關知識。 PAC 系統(tǒng)是繼 PLC、 DCS之后的新一代控制系統(tǒng)，綜合了計算機技術、自動控制技術和通信技術的一種新型的、多功能控制器平臺，廣泛應用工業(yè)控制領域。 關鍵詞： 液位控制 ； PACSystems RX3i； 實 時監(jiān)控； 以太網(wǎng) Abstract The level control is one of the mon industrial process control, it is widely used in cooling towers, boilers, highrise buildings, water tanks, tanks, industrial chemical tank level measurement of the pressure vessel. With the advances in technology, production control accuracy requirements are high, so to improve the performance of the liquid level control system is very important. The PAC system is following a new generation of PLC, DCS control system, a bination of puter technology, automatic control technology and munication technology, a new, multifunction controller platform, widely used in industrial control field. Therefore imperative that we study the design of the PAC the RX3i level control system. This design uses the PACSystems RX3i controller tank level device control system design. The master control object for laboratory equipment of the Water Level PA